Cunning as a dunny rat
simile
Sly and crafty.
Person 1"Wazza got out of the washing up again."
Person 2"Cunning as a dunny rat, that one."
You'll also hear
Cunning as a shithouse ratcommon version
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While you're here
Flat out like a lizard drinking
Extremely busy. Can be sarcastic about someone who isn't busy at all.
Dry as a dead dingo's donga
Extremely thirsty. Also used for weather that has not seen rain in months.
Full as a fat woman's sock
Completely full, usually after a big feed. Sometimes used for very drunk.
Flash as a rat with a gold tooth
Showing off and very pleased with yourself.
Rare as rocking-horse poo
Almost impossible to find.
Happier than a dog with two tails
Extremely happy.
